Tubeless setup leaking from some spoke holes and valve stem

I'm currently using a ZTR 355 rim with yellow tape, and Stans valve stem. I seem to be leaking air out of a few spoke holes and at the valve stem. The tape seems fine and the valve stem seems to be sitting in the hole ok. Anyone have this problem before? My bead is set well and no leaks there.

 

Is all the tape still adhered to the rim? It sure sounds like air/fluid is leaking into the rim cavity somehow.

I have had one issue where I had to taper the valve hole with a counter-sink bit.

http://www.amazon.com/General-Tools-195-3-4-Inch-Countersink/dp/B00004T7OS

This allowed the valve stem to seat cleaner, no more problems. Also, I would remove the valve stem and check the seal to see if its damaged.

 

Is the valve seated tight against the valve hole?

 

Valve stem is tight. No visible gaps. I was thinking of countersinking the hole. The hole looks a tad lopsided. All the tape is stuck well. I'll try retaping.

 

Check the tape for damage. If you find it you can add a short second layer of tape.

All it takes is one hole for your symptoms to show up. The liquid can travel around inside the rim and exit anywhere, even at the outer valve hole.

 

It just takes a bit.

 

I've used valve stems cuts from defunct tubes. I've had practice cutting the rubber to fit the valve hole. Cutting rubber seems easier than countersinking the rim.

 

In this case, I think the ZTR rim hole was drilled incorrectly and any valve stem will leak.

 

Fixed it I think. Retaped and put an extra strip on the valve stem hole. Instead of cutting a hole for the valve stem, I cut 2 slits in a cross pattern and jammed the valve stem through.

 

might be a stupid question, but are you using the captive nut on the valve? I make my own valves too with left over tubes and I tighten the nut down to ensure a good seal and it's worked so far. careful with countersinking the hole...if it isn't done clean, it can cause more problems. i would only go so far as to deburr it, if it needs it at all.

 

I didn't make my own valve stem. I got a Stans one specific for the ZTR 355 rim. I used the nut.

 

I see you might have fixed it but I'll post this up anyways.

On the ZTR rims, if the tape, 21mm, was installed properly on a rim that was prepped properly there should be no leakage from any of the nipples UNLESS you have a defective rim and there is a bad spot near the joint that is leaking.

As for the valve stem, Stans has two different stems, one for the Flow rims and one for the other ZTR rims. I believe the Flow valve stem is a bit narrower then the others so it may not be sealing the hole properly if that was the stem you used. There should be tape under the seal of the stem around the hole as well, if to much tape was removed it could possibly leak by the seal.
If it is leaking through the stem then you just need to tighten up the core and that should fix it unless of course you received a defective vale.

 

It was the right valve stem. There was what visibly looked like enough tape overlapping the rubber taper on the valve stem. I just added an extra strip of tape where the valve stem hole was and instead of cutting a hole, I just cut 2 slits in the shape of a cross so there was more overlap to help seal. Abui just PM'ed me and this actually might be the official way to do it according to stans, instead of cutting a hole.